I don't think the first two are necessary a big deal in a western liberal democracy. We already have fairly strict legislation around data protection and selective hiring based on certain characteristics (like ethnicity - which is really just a much less accurate form of genetic classification).

There might be a period where we haven't legislated against that sort of stuff. But once we do there's going to be a pretty big paper trail if a potential employer or insurance provider is searching a genetic database for you.

Dictators? Yes, they could do that. But they could already send you to the gulag because of how you look, who you're friends with, what you said in the pub etc. It's another tool in their arsenal maybe, but it's not like they don't have a lot anyway.